Iris Ultra Cotton Quilting Thread is made from highly mercerized, long staple Egyptian cotton. That means it has the longer fibers and special processing to give it a smoother surface and improved luster. And now this Ultra quilting thread is available in a new kit. The Iris Ultra Cotton Quilting Thread Kit comprises 24 spools of Size 50 Long Staple Egyptian cotton--18 solids and 6 variegated. Each mini king spool contains 1100 yds. of thread.